General Tracking Information

Overall, 97.83% of samples had a recorded gaze position.

The total number of blocks in this design was 105. This was calculated as the number of trials multiplied by the number of blocks within each trial.

Out of those blocks, 0 were completely missing data. These missing blocks can be seen below:

trials_this_n block n tracked perc

The percent of samples tracked within each block can be seen below:

trials_this_n block n tracked perc
0 fixation 984 830 84.35
0 stimulus 3499 3499 100.00
0 text 2986 2851 95.48
1 fixation 980 980 100.00
1 stimulus 3501 3501 100.00
1 text 3009 2839 94.35
2 fixation 975 975 100.00
2 stimulus 3498 3391 96.94
2 text 3011 2911 96.68
3 fixation 992 992 100.00
3 stimulus 3498 3498 100.00
3 text 3005 2874 95.64
4 fixation 977 977 100.00
4 stimulus 3501 3501 100.00
4 text 3006 2824 93.95
5 fixation 978 978 100.00
5 stimulus 3500 3500 100.00
5 text 3005 3005 100.00
6 fixation 977 977 100.00
6 stimulus 3501 3407 97.32
6 text 3008 2873 95.51
7 fixation 976 976 100.00
7 stimulus 3499 3499 100.00
7 text 3010 2880 95.68
8 fixation 990 990 100.00
8 stimulus 3500 3500 100.00
8 text 3010 2873 95.45
9 fixation 991 991 100.00
9 stimulus 3498 3498 100.00
9 text 3010 2826 93.89
10 fixation 974 974 100.00
10 stimulus 3500 3500 100.00
10 text 3005 3005 100.00
11 fixation 977 977 100.00
11 stimulus 3501 3501 100.00
11 text 3010 2831 94.05
12 fixation 992 992 100.00
12 stimulus 3499 3499 100.00
12 text 3009 2818 93.65
13 fixation 992 830 83.67
13 stimulus 3498 3358 96.00
13 text 3010 3010 100.00
14 fixation 992 992 100.00
14 stimulus 3498 3369 96.31
14 text 3010 3010 100.00
15 fixation 992 992 100.00
15 stimulus 3498 3498 100.00
15 text 3009 2834 94.18
16 fixation 990 990 100.00
16 stimulus 3502 3502 100.00
16 text 3009 2780 92.39
17 fixation 991 991 100.00
17 stimulus 3499 3499 100.00
17 text 3010 2816 93.55
18 fixation 989 989 100.00
18 stimulus 3501 3501 100.00
18 text 3006 2839 94.44
19 fixation 977 977 100.00
19 stimulus 3500 3500 100.00
19 text 3007 2806 93.32
20 fixation 976 976 100.00
20 stimulus 3499 3499 100.00
20 text 3012 2817 93.53
21 fixation 990 990 100.00
21 stimulus 3500 3500 100.00
21 text 3007 2807 93.35
22 fixation 976 976 100.00
22 stimulus 3500 3500 100.00
22 text 3009 2937 97.61
23 fixation 974 908 93.22
23 stimulus 3516 3516 100.00
23 text 3008 3008 100.00
24 fixation 975 975 100.00
24 stimulus 3501 3386 96.72
24 text 3010 2847 94.58
25 fixation 991 991 100.00
25 stimulus 3499 3499 100.00
25 text 3003 2867 95.47
26 fixation 979 979 100.00
26 stimulus 3501 3501 100.00
26 text 3009 3009 100.00
27 fixation 991 991 100.00
27 stimulus 3501 3380 96.54
27 text 3008 3008 100.00
28 fixation 992 992 100.00
28 stimulus 3499 3499 100.00
28 text 3004 2967 98.77
29 fixation 980 980 100.00
29 stimulus 3499 3499 100.00
29 text 3010 2783 92.46
30 fixation 991 991 100.00
30 stimulus 3499 3499 100.00
30 text 3009 2757 91.63
31 fixation 991 991 100.00
31 stimulus 3499 3499 100.00
31 text 3011 2806 93.19
32 fixation 989 989 100.00
32 stimulus 3501 3361 96.00
32 text 3007 2866 95.31
33 fixation 975 975 100.00
33 stimulus 3501 3501 100.00
33 text 3010 2821 93.72
34 fixation 990 990 100.00
34 stimulus 3500 3500 100.00
34 text 3013 3013 100.00

Gaze Position

All gaze position data is taken after the instructions were completed. Presented data is average gaze position as given by the eyetracker. Samples where no eyetracking data is recorded are removed from the overall count.

  • % of time participant was gazing on screen: 99.93%.
  • % of time participant was gazing within the stimulus area during stimulus blocks: 99.93%.

Pupil Size

Distribution of Pupil Sizes

Eyelink reports pupil data from left and right eyes as well as the average of the two. The preprocessing pipeline performs mean and median normalization on all 3 measures relative to prefixation and fixation baselines. The following plots show the distribution of pupil sizes for samples where the participant has their gaze on the screen during the experiment (i.e. past the instructions block).

Pupil Sizes During Stimuli

Epoch Median

Median average (combined left and right values) pupil size is plotted for each stimulus block as a function of epoch. Raw values are plotted followed by prefixation and fixation-normalized values, respectively. Within stimulus blocks, patterns of change in pupil size are not different across the raw and two types of normalization, however the differences pupil size between blocks does differ across normalizations. The extent to which they differ is dependent on the variance in pupil size during the chosen normalization block across samples.

Pupil Size and Gaze Position

Median average pupil size are plotted as functions of gaze position during stimulus blocks. Only positions within the boundary of the stimulus area are plotted. Non-normalized median values are plotted first followed by prefixation normalized, and then fixation normalized.

Raw Pupil Size

Prefixation Normalized

Fixation Normalized